JPH097705A - Coaxial cable connector and assembling method thereof - Google Patents

Abstract

(57) [Summary] [Object] To provide a coaxial cable connector that improves the efficiency of the work of fixing the inner conductor and the center conductor and stabilizes the electrical contact resistance, and an assembling method thereof. A center conductor 26 that electrically connects an inner conductor 24 of the coaxial cable 21 and an inner connection conductor 25a outside the coaxial cable 21 is supported by an insulating member 27 so as to be electrically insulated from the outer conductor 22. The contact insulator 28 is provided, and the center conductor 26 is formed with the pressure contact portion 38 that is pressure-contacted with the internal conductor screw attachment portion 36 formed at the tip of the internal conductor 24 by the tightening force when the internal conductor screw attachment portion 36 is screwed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial cable connector and a method for assembling the same.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 5, a coaxial cable connector has a rod-shaped center conductor 3 at the end of an inner conductor 2 of the coaxial cable 1 at the end of the coaxial cable 1.
To electrically connect the conductive member 4 insulated from the center conductor 3 to the outer conductor 5, and to attach the center conductor 3 and the conductive member 4 to the outside of the outer conductor 5. The housing 6 is housed in the housing 6 and can be electrically connected to the target connection conductors 7a and 7b outside the coaxial cable connector.

In the center conductor 3, the interior portion 8 formed at the rear end (the left end in FIG. 5) is inserted into the tip of the internal conductor 2 and the pin 9 is inserted through the interior portion 8 and the internal conductor 2. The internal conductor 2 is prevented from coming off from the interior portion 8. The housing 6 is provided with an insertion hole 10 that is inserted into the connection conductor 7 to electrically connect the inner conductor 2 and the outer conductor 5 to the connection conductor 7.

[0004]

By the way, in the case of the coaxial cable connector as described above, when fixing the inner conductor 2 and the center conductor 3 with the pin 9, the outer conductor 5 and the inner portion around the tip of the inner conductor 2 and the inner conductor 2 are fixed. It is necessary to remove the insulating material 11 and the like filled between the conductor 2 and the outer conductor 5 and to form an insertion hole for inserting the pin 9 at the exposed tip of the inner conductor 2. Took a lot of time. Also, the inner conductor 2
Since it is difficult to ensure the dimensional accuracy of the tip of the internal conductor 2, a clearance is created between the tip of the internal conductor 2 and the inner surface of the interior portion 8, making it difficult to stabilize the fixed state of both and electrically unstable the contact resistance. Was occurring. Further, there are various other fixing structures for fixing the inner conductor 2 and the central conductor 3, but none of them have high fixing work efficiency and electrically stable connection resistance.

The present invention has been made in view of the above-mentioned problems, and provides a coaxial cable connector and a method of assembling the same, which improves the efficiency of the work of fixing the inner conductor and the center conductor and stabilizes the electrical contact resistance. It is intended to be provided.

[0006]

The present invention has the following features to attain the object mentioned above. That is, in the coaxial cable connector according to claim 1, the central conductor, which is electrically connected to the inner conductor of the coaxial cable terminal and electrically connects the inner conductor to the connection conductor outside the coaxial cable, is formed of the insulating member. A contact insulator that is electrically insulated from and supported by an outer conductor, and an outer cover that is attached to a coaxial cable terminal and that houses the contact insulator therein. A central conductor screwing portion that can be screwed is formed on the conductor screwing portion, and a pressure contact portion that is pressed against the inner conductor screwing portion by a tightening force when the internal conductor screwing portion is screwed is formed on the central conductor screwing portion. The formation is defined as the means for solving the above problems.

In the method of assembling the coaxial cable connector according to the second aspect, at least the tip of the inner conductor is exposed at the end of the coaxial cable, and the inner conductor can be screwed to the center conductor screwing portion formed in advance on the center conductor. First step of forming the inner conductor threaded portion on the inner conductor, and after the completion of the first step, the center conductor threaded portion is threaded onto the inner conductor threaded portion to form the inner conductor threaded portion on the press contact portion. And a second step of bringing the above into contact with each other.

[0008]

According to the coaxial cable connector of the present invention, when the central conductor screw-fastened portion of the central conductor is screwed into the internal conductor screw-fastened portion of the inner conductor and fixed, the internal conductor screw-fastened portion is press-fitted. It is pressure-contacted with and secures electrical continuity between the inner conductor and the central conductor.

According to the method of assembling the connector for a coaxial cable of claim 2, the inner conductor exposed at the end of the coaxial cable is fitted with the inner conductor screw fitting portion by using a tool such as a tap. Form the joint at the work site.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the coaxial cable connector of the present invention will be described below with reference to FIGS. Reference numeral 2 in the figure
Reference numeral 0 denotes the coaxial cable connector of this embodiment. As shown in FIGS. 1 and 2, the coaxial cable connector 20 is provided with an exterior nut member 22 that is exteriorly mounted on the end of the coaxial cable 21, and is screwed to the tip side of the exterior nut member 22 (right side in FIG. 1, right upper side in FIG. 2). The outer cover body 23 that is attached to the outer nut member 22 and constitutes the outer cover, and the coaxial cable 2
The central conductor 26, which is supported by one terminal and electrically connects the inner conductor 24 of the coaxial cable 21 and the inner connecting conductor 25a outside the coaxial cable 21, is electrically insulated from the outer conductor 22 by an insulating member 27. The contact insulator 28 is supported, and the external conductive member 30 is interposed between the inner surface of the exterior nut member 22 and the outer surface of the outer conductor 29 of the coaxial cable 21.

The exterior nut member 22 constitutes an exterior cover together with the exterior cover body 23. As a material for forming the exterior nut member 22 and the exterior cover body 23, a material having excellent conductivity and waterproofness is applied. This outer cover forms a conductive path between the outer conductor 29 and the outer connecting conductor 25b outside the coaxial cable 21, and by sandwiching the outer conductive member 30 between the outer conductor 29 and the outer surface of the outer conductor 29, stability is ensured. The contact resistance that is set is obtained.

The exterior nut member 22 is a coaxial cable 21.
Is a cylindrical body having an inner diameter that is in close contact with the outer surface of the outer sheath 31, and the outer cover main body 23 is provided at a substantially central portion in the axial direction.
A screw portion 32 for screwing is attached. The inner surface of the threaded portion 32 of the exterior nut member 22 is a water stop surface 22a that comes into close contact with the outer surface of the exterior sheath 31 of the coaxial cable 21 to stop water. A tool engaging surface 22b for engaging a tool for rotating the exterior nut member 22 is formed at the end portion of the screw portion 32 on the base end side. Further, the tip side of the exterior nut member 22 with respect to the threaded portion 32 has a threaded portion 32.
The inner diameter is reduced from the portion, and the outer surface of the outer conductor 29 is removed by exposing the outer sheath 31 of the end of the coaxial cable 21 to form a holding surface 22c for holding the outer conductive member 30. An O-ring 22d for stopping water is attached to the base end side of the water stopping surface 22a (left side in FIG. 1, lower left side in FIG. 2). The outer conductive member 30 is a substantially cylindrical body whose cross-sectional shape is reduced in diameter toward the one side 33 in the axial direction, and the end portion of the ring-shaped other side 34 is used as a base end from the end portion of the other side 34. It is formed mainly of a large number of fins 35 extending toward the side.

The contact insulator 28 is
The disk-shaped insulating member 27 and the rod-shaped central conductor 26 fixed to the insulating member 27 through the insulating member 27 on the central axis of the insulating member 27 are provided.
As shown in FIGS. 1 to 3, the central conductor 26 has a portion projecting from the insulating member 27, which can be screwed to an internal conductor screwing portion 36 formed at the tip of the internal conductor 24.
It has been. The center conductor screw attachment portion 37 is formed as a male screw. A pressure contact portion 38 is formed at a base end portion of the central conductor screwing portion 37 so as to be brought into pressure contact with the inner conductor screwing portion 36 by a tightening force when the inner conductor screwing portion 36 is screwed. The pressure contact portion 38 is formed in a tapered portion in which the diameter gradually increases toward the insulating member 27 side in the axial direction of the internal conductor threaded portion 36.

A portion of the central conductor 26 projecting from the insulating member 27 in a direction opposite to the internal conductor screwing portion 36 is connected to the connecting end portion 39 to which the internal connecting conductor 25a is connected.
It has been. The connecting end portion 39 is formed in a cylindrical shape. A locking hole 39a for inserting a pin punch for rotating the contact insulator 28 around the axis is formed along the diameter of the connection end 39 at the base end of the connection end 39.

As a material for forming the insulating member 27, a dielectric insulator or the like is preferable. Outer peripheral portion 4 of this insulating member 27
The guide taper portion 41 for guiding the outer cover body 23 to a predetermined position with respect to the insulating member 27 when the outer cover body 23 is mounted on the outer side of the insulating member 27 on the side facing 0 of the connecting end 39. Are formed. The guide taper portion 41 guides the outer cover body 23 by coming into contact with a guide step portion 42 formed in a ring shape on the inner surface of the outer cover body 23. Further, the insulating member 27 is provided in the insertion concave portion 4 formed inside the guide step portion 42.
3, the portion of the insulating member 27 facing the central conductor screwing portion 37 when flushly inserted into the insertion recess 43 is flush with the guide step 43 or the insertion recess 43. It is designed to be recessed in the back.

As shown in FIGS. 1 and 2, the outer cover body 23 has an O-ring 44 that abuts on the outer surface of the outer nut member 22 to stop water, and a base end side of the O-ring 44 (see FIG. 1). It is a cylindrical body that is formed on the left side (lower left in FIG. 2) and that has an exterior screwing portion 45 that is screwed to the nut portion 44 of the exterior nut member 22 on the inner surface side. At the other end of the exterior threaded portion 45, a central conductor interior portion 46 that accommodates the connection end portion 39 of the central conductor 26 is provided. The central conductor interior portion 46 is formed in a shape in which the exterior screw attachment portion 45 has a reduced diameter.

The guide step portion 42 is formed at an end portion of the exterior screwing portion 45 near the center conductor interior portion 46. The area on the inner surface side of the connecting wall 47 that connects the guide step portion 42 and the central conductor interior portion 46 is the insertion recess 43.
A central conductor insertion hole 48 for accommodating the connecting end portion 39 in the central conductor interior portion 46 is communicated with the insertion recess 43. A tool engaging groove 48 for rotating the outer cover body 23 with a tool or the like is provided on the outer peripheral portion of the connecting wall 47.
Are formed.

A mounting ring 49 for mounting the outer cover main body 23 on the structure is provided at the other end of the central conductor inner portion 46. The attachment ring 49 is rotatably provided in a plane perpendicular to the central axis of the outer cover body 23, and is fixed to the structure so that the outer cover body 23 is rotatably supported with respect to the structure. It is supposed to do.

As shown in FIG. 4, the coaxial cable 21 to which the coaxial cable connector 20 of the present embodiment is applied is, for example, a coaxial cable for a power supply line, and the inner conductor 24 using a copper pipe, The outer conductor 29, which is a corrugated copper pipe and is arranged concentrically with the inner conductor 24 on the outer side of the insulator 50 that covers the outer peripheral surface of the inner conductor 24, covers the outer conductor 29. The outer sheath 31 made of resin is provided. A corrugated groove 30a that fits the outer surface of the outer conductor 29 is formed on the inner surface of the outer conductive member 30.

The method of assembling the coaxial cable connector 20 will be described below. First, at the end of the coaxial cable 21, at least the tip of the internal conductor 24 is exposed, and a tap is inserted from the tip to form the internal conductor threaded portion 36. The internal conductor screwing portion 36 needs to be formed as a female screw that can be screwed to the center conductor screwing portion 37 formed in advance on the center conductor 26. For example, in the case of a tap diameter of 8 mm, the axial dimension is 20 mm. Form. In addition, at this time, the outer sheath 31 is attached from the tip of the coaxial cable 21 to the inner conductor threaded portion 3
The outer conductor 29 is exposed by removing the outer conductor 29 a little further than the formed length. (First step)

Next, cutting powder and the like generated when the tap is used with the brass wire brush is dropped from the removed portion of the outer sheath 31, and the inner conductor 24 and the outer conductor 29 are cleaned with alcohol, and then the center conductor is screwed on the inner conductor screwed portion 36. The screwing portion 37 is screwed and the tip of the internal conductor screwing portion 36 is brought into pressure contact with the pressure contact portion 38. (Second Step) At this time, the internal conductor screw attachment portion 36 is expanded and deformed by the pressure contact force with the pressure contact portion 38. The inner conductor 24 is connected to the pressure contact portion 3
Since it is brought into contact with the central conductor 26 by pressure contact with 8, the tip surface may be somewhat rough.

Next, after applying silicone grease to the outer surface of the outer sheath 31, the outer nut member 22 is inserted into the coaxial cable 21 from the base end side. At this time, in the exterior nut member 22, the portion where the inner sandwiching surface 22c is formed is the exterior sheath 31.
By contacting the tip, the coaxial cable 21 is stopped at an appropriate insertion position. The exterior nut member 22 includes a portion where the holding surface 22c of the exterior nut member 22 is formed and a water blocking surface 22.
Since there is a step at the boundary with the portion where a is formed, the step is inserted until the tip of the outer sheath 31 abuts on this step, so that the outer sheath 31 is roughly positioned at an appropriate insertion position.

Next, the outer conductive member 30 is press-fitted between the outer surface of the outer conductor 29 and the holding surface 22c of the outer nut member 22. Since the outer conductive member 30 has a shape in which the diameter thereof increases toward the other side 34, the outer surface of the outer conductor 29 and the exterior nut member 22.
By inserting it from the one side 33 between the clamping surface 22c and the holding surface 22c, it is stopped at the insertion position where an appropriate clamping force is generated. Further, when the press-fitting of the external conductive member 30 is completed, the contact state between the external conductive member 30 and the external conductor 29 and between the external conductive member 30 and the exterior nut member 22 is stably maintained by the clamping force. Exterior nut member 22
The contact resistance in electrical continuity between and is stable. At this time, in the outer conductive member 30, the end portion of the other side 34 is the outer conductor 29.
Insert it to a depth deeper than the tip.

Next, the central conductor screw-fastening portion 37 of the contact insulator 28 is manually screwed into the internal conductor screw-fastening portion 36, and a pin punch is inserted into the locking hole 39a of the connecting end portion 39, which is sufficient. Then, the tip of the internal conductor screw-attached portion 36 is pressed against the press-contact portion 39 to be deformed. By doing so, electrical conduction between the inner conductor 24 and the center conductor 26 is sufficiently achieved, and the contact resistance is stabilized. At this time, the contact insulator 28 is screwed into the inner conductor 24 at a depth at which the other side 34 of the outer conductive member 30 contacts the contact insulator 28. By the light, the clamping force of the external conductive member 30 is stably maintained.

Next, while pulling the outer nut member 22 toward the end of the coaxial cable 21, the outer cover main body 23 is screwed to the screw portion 32 to which the screw lock is applied. At this time, the exterior nut member 22 is fixed using a tool by utilizing the tool engagement surface 22b, and the exterior cover body 23 is relatively fixed to the exterior nut member 22 by the tool fixed in the tool engagement groove 48. Rotate and screw. In addition, the exterior cover body 23
Is the outer conductive member 3 of the contact insulator 28.
The guide taper 41 formed at 0 guides the guide step 42, so that the outer conductive member 30 can be easily installed in the insertion recess 43 in a normal posture.

The outer cover body 23, which has been attached to the end of the coaxial cable 21, is attached to the structure using the attachment ring 49 or fixed to the connector attached to the end of another coaxial cable 21. By doing this,
The coaxial cable 21 and the internal connection conductor 25a and the external connection conductor 25b outside the coaxial cable 21 are stably connected. Further, between the base end side of the exterior nut member 22 and the exterior sheath 31 of the coaxial cable 21, it is desirable to improve waterproofness by means such as mounting a waterproof tape from the outside.

Therefore, according to the coaxial cable connector and the method of assembling the same of the present invention, the inner conductor threaded portion 36 is formed.
Is brought into pressure contact with the pressure contact portion 38 to be deformed so that the inner conductor 24 and the center conductor 26 are electrically connected to each other, and the inner conductor threaded portion 36 and the pressure contact portion 38 are brought into contact with each other by the inner conductor threaded portion 36. Since it is maintained by the screwing force with the central conductor screwing portion 37, the electrical contact resistance between the internal conductor 24 and the central conductor 26 is stably maintained, and the coaxial cable 21 and the internal connecting conductor 25a connected to the coaxial cable 21 and The external connection conductor 25b can be connected with a stable electric resistance. In addition, the outer conductor 29 and the outer connecting conductor 25b
The electrical resistance is stabilized by the use of the external conductive member 30 even in the electrical conduction with. Moreover, the central conductor screwing portion 37 of the central conductor 26 is screwed to the internal conductor screwing portion 36 formed on the internal conductor 24 in the field.
It is not necessary to remove components such as the outer conductor 29 in the vicinity of the processed portion 4 and the work is simple. Moreover, the inner conductor 24
By forming the inner conductor threaded portion 36 that can be threadedly engaged with the center conductor threaded portion 37 at the tip 51, the accuracy requirement is low and the work efficiency of assembly is improved.

In the coaxial cable connector 20 of this embodiment, the external conductor 29 and the external connection conductor 25b are electrically connected to each other by the external conductive member 30 and the exterior nut member 22.
However, if the external conductive member 30 having a shape that makes stable contact with the exterior cover body 23 is used, it is not necessary to pass through the exterior nut member 22. It is also possible to change the shapes of the external conductive member 30 and the outer cover main body 23 so that the external conductive member 30 is in direct contact with the external connection conductor 25b.

[0029]

As described above, according to the coaxial cable connector of the first aspect, the internal conductor of the coaxial cable terminal is electrically connected, and the internal conductor and the connection conductor outside the coaxial cable are electrically connected. A center insulator connected to, a contact insulator that is electrically insulated and supported by the outer conductor with an insulating member, and an outer cover that is attached to the coaxial cable terminal and that houses the contact insulator therein, The central conductor has a central conductor screwing portion that can be screwed into the internal conductor screwing portion formed at the tip of the internal conductor, and the central conductor screwing portion is internally attached by the tightening force when the internal conductor screwing portion is screwed. By forming a pressure contact portion to be pressure-contacted with the conductor screw attachment portion, the inner conductor screw attachment portion is pressed into contact with the pressure contact portion and deformed to electrically connect the inner conductor and the center conductor to each other. Since the pressure contact state between the inner conductor portion and the pressure contact portion is maintained by the screwing force between the inner conductor screw-in portion and the center conductor screw-in portion, the electric contact resistance between the inner conductor and the center conductor is stably maintained, and the coaxial contact is maintained. It is possible to connect the cable and the connecting conductor connected to the coaxial cable with a stable electric resistance.

According to the method of assembling the coaxial cable connector of the second aspect, at least the tip of the inner conductor is exposed at the end of the coaxial cable, and the central conductor screwing portion and the screw formed on the central conductor in advance are screwed together. The first step of forming the attachable inner conductor screw portion on the inner conductor, and after the completion of the first step, the center conductor screw portion is screwed onto the inner conductor screw portion and the inner conductor screw portion is attached to the pressure contact portion. The second step of press-contacting the attachment portion and the internal conductor screw attachment portion that fits the center conductor screw attachment portion are formed on site in the internal conductor, so that the work is simple and the tip of the internal conductor is Since a sufficient pressure contact force can be obtained by forming the inner conductor screw-fastening portion that can be screwed to the center conductor screw-fastening portion, the accuracy requirement of the shape of the tip of the inner conductor is low, and the work efficiency of assembly is improved.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of a coaxial cable connector of the present invention.

FIG. 2 is an exploded perspective view showing an embodiment of the coaxial cable connector of the present invention.

3 is an enlarged side view showing a contact insulator used in the coaxial cable connector of FIG.

FIG. 4 is a perspective view showing a coaxial cable to which an embodiment of the coaxial cable connector of the present invention is applied.

FIG. 5 is a front sectional view showing a conventional coaxial cable connector.

[Explanation of symbols]

20 ... Coaxial cable connector, 21 ... Coaxial cable,
22 ... Exterior cover (exterior nut member), 23 ... Exterior cover (exterior cover body), 24 ... Inner conductor, 25a ... Connection conductor (internal connection conductor), 26 ... Center conductor, 27 ... Insulating member, 28 ... Contact insulator, 29 ... Outer conductor, 36 ... Inner conductor screwing portion, 37 ... Center conductor screwing portion, 3
8 ... Pressure contact part, 51 ... Tip.

Claims (2)

[Claims] 1. A coaxial cable connector (20) used for a coaxial cable (21) having an inner conductor (24) and an outer conductor (29), which is electrically connected to an inner conductor of a coaxial cable terminal. A contact insulator (28) in which a center conductor (26) for electrically connecting the inner conductor and a connection conductor (25a) outside the coaxial cable is supported by being electrically insulated from the outer conductor by an insulating member (27). ) And an outer cover (22, 23) attached to the end of the coaxial cable and accommodating the contact insulator therein, and the central conductor is screwed to the internal conductor screwing portion (36) formed at the tip of the internal conductor. A center conductor screw-attaching portion (37) that can be attached is formed, and a pressure contact portion (38) is press-contacted with the inner conductor screw-attaching portion by a tightening force when the inner conductor screw-attaching portion is screwed. Connector for coaxial cable, characterized in that There are formed. 2. A method for assembling a coaxial cable connector, wherein the coaxial cable connector according to claim 1 is assembled to a coaxial cable terminal, wherein at least the tip (51) of the inner conductor is exposed at the end of the coaxial cable. A first step of forming an internal conductor screw-fastening portion that can be screwed with the central conductor screw-fastening portion that has been formed on the central conductor on the internal conductor, and after the completion of the first step, center the internal conductor screw-fastening portion. A second step of screwing the conductor screw-fastened portion and press-contacting the internal conductor screw-fastened portion to the press-contacting portion.